I am running into an issue where plyplus is erroring out with:
plyplus
File \"/Users/FOO/.virtualenvs/ff/lib/python2.7/site-packages/plyplus/grammars/
Coming from OSX 10.14.2, I fixed it by changing my primary language to English (US) instead of English.
English (US)
English
This is also discussed here: https://stackoverflow.com/a/38557558/4960855